worlds smallest chicken egg/with pics!

Today my DH found this in the coop near the chickens water!! It is so small! We wonder if it is from our D'uccle pullets or our cochin pullets! I thought d'uccles laied white or a cream colored eggs? This little egg is the color the cochins have been laying!
It just goes to show you, you never know what your gonna find in the coop from day to day! This is the best part of keeping chickens!
Brenda